/*
 * @Description:基本数据类型
 * @Author: admin
 * @Date: 2021-06-04 11:07:02
 * @LastEditors: admin
 * @LastEditTime: 2021-06-07 15:15:58
 */
var a = "string"
console.log(typeof a);
// "string"
var b = true
console.log(typeof b);
// "boolean"
var c = "undefined"
// "string"
var c = undefined
// "undefined"